Driving and stopping mechanism.



W. A. SMITH.

WRIVING AND STOPPING MECHANISM.

APPLICATION FILED JULY I1, 1916.

2 SHEETS- I.

* 1,2s9,29s Patented Dec. "1918.

' fir ww X. 5,2412% M244 W. A. SMITH.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED JULY 11. l9l6.

LQ89,Q93, Patented Dec. 31,1918.

2 SHEETSSHEET 2.-

r 7 m w. 3 6

39- Q Z wW/M I Jo @Mym YZ UNITED STATS ENT @FFTGE.

WILLARD A. SMITH, OF MELROSE, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY,

A CORPORATION OF NEW JERSEY.

DRIVING AND STOPPING MECHANISM.

Patented Dec. 31, 11218.

Original application filed June 1, 1915, Serial No. 31,459. Divided and this application filed July 17, 1916. Serial No. 109,786.

To all whom it may concern:

Be it known that I, WILLARD A. SMITH, a citizen of the United States, residing at'Melrose, in the county of Middlesex and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Driving and Stopping Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to driving and stopping mechanism adapted for use in sewing or other machines which should be stopped with the parts in a predetermined position.

The object of the invention is to provide novel and improved mechanism for disconnecting a driven shaft from the source of power and stopping it in a predetermined I position,|which will operate in a uniformly reliable manner without undue shock or jar, and in which the power throw-0E and stopping devices areso connected that they may be readily set to enable the operator to throw out the stop devices without throwing on the power when the shaft is to be manually turned. A further object is to provide novel and improved means for continuously driving a shaft or mechanism from a belt which is shifted between fast and loose pulleys to intermittently drive another shaft or mechanism. I

To these ends the invention comprises the features of construction and combinations of parts hereinafter described and referred to in the claims.

The present application is a division of application Serial No. 31,459, filed June 1, 1915, for button sewing machines, and the invention is shown as embodied in a mechanism for driving and stop ing the button sewing machine of that app ication.

In the drawings, Figure 1 is a vertical sectional elevation showing a mechanism embodying the invention in its preferred form; Fig. 2 is a detail of a one-way clutch dog for connecting the fast and loose pulleys; Fig. 3 is a sectional elevation on line 3, of Fig. 1; Fig. 4 is a bottom view, the machine frame being swung up to bring its bottom into a vertical plane; and Fig. 5 is a detail of the latch for connecting the power throw-off and stop devices.

The invention is shown applied to a button sewing machine, the operating parts of which are mounted in a frame 2 pivoted at 4 on a base 6 so that it may be swung up into the position indicated in Fig. 4, to give access to the cam shaft and other parts of the operating mechanism. The various parts of the machine are operated from a cam shaft 8 which makes one revolution for each cycle of the machine This shaft is driven through mechanism which is thrown into operation by a manually controlled device, such as a treadle,.and which upon the release or shifting of the treadle, ope-rates to stop the shaft, and therefore the parts of the machine, in a predetermined position.

As shown, the cam shaft 8 is driven from a driving shaft 10 through gearing which is so proportioned that the cam shaft makes one revolution for two revolutions of the driving shaft. The driving shaft is driven through a belt 12 adapted to be shifted between the tight pulley 14 and the loose pulley '16 in starting and stopping the machine.

The means for shifting the belt to throw the power on and off comprise a belt shifter 18 formed on one end of a belt shifter bar 20 which is mounted to slide in bearings in the machine frame. and is connected by means to be described with the stopping devices, so

plunger 22 provided with. a wedge-shaped end adapted to enter a corresponding notch 24 formed in a stop cam 26 which is secured to the driving shaft 10. The plunger is mounted to slide in a cylindrical bearing formed in a block 28 which is secured to the end of a shifter rod 30. The stop plunger is forced forward in its bearing by a spring 32 interposed between a collar on the plunger and an adjusting block 34 screwed into the end of the bearing. The shifter rod 30 is forced in a direction to bring the stop plunger into register with the stop cam by a spring 36 which is interposed between one of the bearings for the rod and a collar 38 pinned to the rod. The block 28 is supported and guided by a lug 40 which projects from the machine frame and underlies a projecting lug 42 on the block. The lugs are eld in engagement by a plunger 44 mounted in a bearing in the block 28, and forced against the under side of a lug 46 by a spring 48 interposed between a collar, on the plunger and an adjusting plug 50 screwed into the lower end of the bearing. The shifter rod and stop plunger carried thereby are retracted to withdraw the plunger laterally from engagement with the stop cam by a bell crank lever 52 pivoted on the base 6 of the machine, and having its upper end arranged to lie between a shoulder 54 on the shifter rod and an opposed latch 56 pivoted on the rod. The other arm of the bell crank lever is connected by av link 58 with the controlling treadle. The bell crank lever is held in position for its vertical arm to register w1th the recess between the shoulder 54 and latch 56 when the stop plunger is in engagement with the stop cam by a spring 60.

The means for connecting the controlling treadl'e with the power throw-off and stopping devices permitsthe machine frame to be readily turned up'about its pivotal supports, as indicated in Fig. 3, and insures the proper engagement of the parts with the treadle mechanism when the frame is rearranged to overlie and underlie the rod, the

underlying stop being spaced sufficiently from the rod to allow the upward movement of the latch,.as above described.

The belt, shifter bar'20 is connected with the shifter rod 30 by coupling in the form of a latch 62 pivoted on the bar, and having a laterally projecting end arranged to enter a notch formed in the collar 38 which is secured to the rod 30. The latch thus normally connects the belt shifter bar with the shifter rod, so that the belt is shifted on to the tight pulley when the stop plunger is disengaged from the stop cam on the driving shaft, and is shifted on to the loose pulley when the stop plunger is moved into register with the stop cam and into position to stop the cam shaft. When the stop plunger is free to movelaterally into active position, it will ride against the side of the stop cam 1,ase,2ee

until the low part of the cam registers with the end of the plunger, when it will move over into register with the stop cam. The end of the plunger will then ride against the swell of the cam, and act to retard the driving shaft until the notch in the cam registers with the end of the plunger, when the plum-- ger will spring forward into the notch, thus arresting and locking the'driving shaft and the connected cam shaft in fixed position. The blow upon the plunger incident to arresting the shafts is cushioned by the spring 48, which yields to allow the block 28 to move upward slightly, after which the recoil of the spring returns the pl 1 1 1 1ger.and driving shaft to final stopping position.

Since the driving shaft makes two revolutions for each revolution of the cam shaft, and consequently two revolutions for each cycle of the machine, a timing or controlling cam 64 is secured to the cam shaft in position to engage a roll 66 on the block 28,

and control the movement of the belt shifting and stopping devices when released by the operator. The controlling cam is shaped to allow the belt shifter to be moved to throw the power off and stop the machine only during every second revolution of the driving shaft, the cam acting to prevent the shifting of the belt and stop plunger during the first revolution of thedriving shaft, in case the operator'releases the treadle before the driving shaft has completed its first revo-' lut-ion.

In order that the operator may readily set or adjust the mechanism, so that the stop I plunger may be moved out of active position without shifting the belt on to the tight pulley, .in case it is desiredto turn the driving shaft by hand, means is providedwithin convenient reach of the operator for disengaging the latch 62, which couples the belt shifter and stopping devices together, thus permitting independent movement of the stop plunger. As shown, this means comprises a rod 68 mounted in the front side of the machine frame, and having its end connected by a link 70 with the latch 62. The end of the rod projects through the front side of the frame, and is provided with a head 72 which normally rests against the face of the casing. The head is provided with a projection 74 which normally enters a recess in the casing. The pin and latch are held yieldingly in normal position by a spring 76. When it is desired to set or adjust the mechanism for independent operation of the stopping devices, so that the shaft is freed and may be turned by hand, the rod 68 is drawn forward and the head 72 is turned until the lug 74 is out of register with the recess in the frame, and is in position to engage the face-of the frame. This withdraws the latch 62 and disconnectsthe stopping devices and belt shifter. The latch is held in withdrawn position by the lug 74 until the head 72 is turned into position for the lug to enter the recess in the frame. When the latch is withdrawn, the belt shifter is locked in position to hold the belt on the loose pulley by a locking lug 7 8 arranged to be engaged by a hook 80 on the latch 62. The belt will be retained on the loose pulley until the latch is returned to normal position and reconnects the belt shipper and stop de vices.

In the machine of the application above referred to there is a shaft or pulley 82 whichis driven through a belt 84 from a small pulley formed on the hub of the ldose pulley 16. It is desirable that the pulley 82 be driven both when the driving belt 12 is on the loose pulley and when it is on the tight pulley and driving the cam shaft. To secure this result, a one-way clutch is provided which connects the tight and loose pulleys. The clutch is so constructed that the loose pulley is free to rotate without transmitting motion to the tight pulley when the belt is on the loose pulley. When the belt is on the tight pulley, however, the clutch will act to connect the two pulleys so that the loose pulley is driven from the tight pulley. In the construction shown the oneway clutch comprises a-clutch dog 86 pivoted on the tight pulley, and so arranged that it will grip the hub of the loose pulley whenthe belt is on the tight pulley. The dog is so arranged that when the belt is on the loose pulley the hub of the pulley will slip freely past the dog, so that the pulley will rotate idly with relation to the tight pulley and driving shaft.

While it is preferred to employ the specific construction and arrangement of the parts shown and described, it will be understood that this construction and'arrangement is not essential to the broader features of the invention, and may be varied and modified as found desirable or best suited to the construction and arrangement of the parts of the machine in which the invention is to be embodied. I

Having explained the nature and object of the invention, and specifically described one form of mechanism in which it may be embodied, what is claimed is 1. Driving and stopping mechanism, having, in combination, a shaft, power throwoff and stopping devices, a shifter for moving the stopping devices into and out of active position, means for actuating the shifter, a power shifter, a coupling connecting the shifters to move in unison, and means for manually disconnecting the coupling to permit the independent operation of the stop shifter by its actuating means.

2. Driving and stopping mechanism, having, in combination, a shaft, power throw-off and stopping devices, a shifter for moving the stopping devices into and out of active position, means for actuating the shifter, a power shifter, a connection between the shifters for moving the power shifter with the stop shifter constructed to permit independent movement of the stop shifter, and means set by the operator for retaining the power shifter in throw-off position and permitting movement of the stop shifter by its actuating means.

3. Driving and stopping mechanism, hav-" ing, in combination, a shaft, a stop cam on the shaft, a stop plunger, a shifter for moving the plunger into and out of register with the cam, a power shifter, a latch for connecting the shifters, and means for manually disengaging the latch.

4. A machine, having, in combination, a base, a frame pivotally mounted on the base, a shaft mounted in the frame, stop devices for the shaft, a shifter for the stop devices mounted on the frame and provided with a shoulder and an opposed pivoted latch, and an actuating lever mounted on the base and arranged to enter the recess between the shoulder and latch.

WILLARD A. SMITH. 

